Coleman recently said that she doesn't feel like a replacement for Karen Gillan and Arthur Darvill, who exited Doctor Who in 'The Angels Take Manhattan' after two and a half series as The Doctor's companions.

"It's a whole new story, it's a whole new character," she stressed. "It changes the Doctor and you've got to go on that journey and also go on your own journey with it, as well."

'The Snowmen' airs at 5.15pm on BBC One in the UK and at 8pm on BBC America.

Watch the trailer for the Doctor Who Christmas special below:

Photo Gallery: 'Doctor Who - The Snowmen'

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The Doctor Who Christmas special: The Snowmen
Copyright: BBC Adrian Rogers
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